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We haven't seen this discussed on TV, but in "Magic of the Angels" (BBC New Series Adventures novel), the Doctor does use a mirror against a Weeping Angel, and it works, and he explains why it works.

An Angel seeing itself isn't a problem. But, as we learned in "The Time of Angels", the image of an Angel becomes an Angel. And that includes a mirror image. And then the original Angel and the mirror-image duplicate Angel are looking at each other, and quantum-lock each other.